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Kōwadō (光和堂) was a Japanese sales company in the mid-1950s. It was listed as an authorized dealer of the Minon Six III made by Yamato Kōki Kōgyō in 1954; its address at the time was Fukuoka-shi Kamidoimachi 22 (福岡市上土居町30), in the island of Kyūshū.[1]